Also found in: Wikipedia.
The technique in which one host, usually a router, answers Address Resolution Protocol (ARP) requests intended for another machine. By "faking" its identity, the router accepts responsibility for routing packets to the "real" destination. Proxy ARP allows a site to use a single IP address with two physical networks. Subnetting would normally be a better solution.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)